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Innumerable creeks,
channels and tidal creeks interlace Sundarbans.
Excepting the Hooghly on the west and the Ichhamati on
the east, all other water channels are delinked from the
headwater sources from the upland rivers. Though the
rivers are tidal in nature, free tidal flushing of the
spill areas was interrupted by premature reclamation of
the land.
Tidal rivers here carry large volume of
sediments only to be deposited on the riverbed creating
acute problem of drainage.
The main estuaries from east
to west are the Raimongal, the Kalindi, the Gosaba, the
Bidyadhari, the Herobhanga, the Bidya, the Matla, the
Thakuran, the Saptomukhi and the Hooghly. The average
tidal amplitude in these estuaries ranges from 3.5 to
5.0 metres.
Composed of Aluvio-estuarine
sediments much of this region lies below 3 metres,
though there are few hummocky grounds scatteredly
distributed in areas adjoining Bishnupur-Mograhat police
stations as well as
Baruipur-Joynagar-Mathurapur-Mandirbazar, along the
remnants of the Adiganga, along the Ichhamati river bank
and in Joynagar-Canning-Basanti-Gosaba areas.
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